Lifting-jack



G. O. LEOPOLD.

11mm; 1AcK.

APPLICATION FILED NOV. 29. 1920.

Patenfa 001. 25, 1921.

2 SHEETS-SHEET l.

G. 0. LEOPOLD.

LIFTING JACK.

APPLICATION FILED N OV= 29. 1920.

y. Patented Oct. 25, 1921.

2 SHEETS-SHEET 2. y

UNITED stares PATENT OFFICE.

GEORGE O. LEOPOLD, OF PHLADELPHIA, PENNSYLVAIQIA, ASSIGNOR T0 NORTH BROS.

MFGr. CO., OF PHILADELPHIA, VANIA.

PENNSYLVANIA, A CORPORATION 0F PENNSYIr' LIFTINGJACK.

Specication of Le tters Patent.

Patented Oct. 25, 1921.

Application ilerl November 29, 1920. Serial No, 427,009.

To all 'whom it may concern:

Be it known that I, GEORGE O. LEOPOLD, a citizen of the 'United States, residing in Philadelphia, Pennsylvania, have invented Lifting-Jacks7 of which the following is a specification.

One object of my invention is to construct a substantial and easily operated lifting jack which will hold a load at any point desired without the use of pawls.

A further obj ect of the invention is to provide a jack that can be reversed by turning the operating handle.

These objects I attain in the following manner, reference being had to the accom-y panying drawings, in which,

Fligure l is a side view of'my improved Jac Fig. 2 is a sectional view on the line 2 2, Fig. l; y p

Fig. 3 is a sectional view Fig. 2; and

Figs. 4 to 8 inclusive are perspective views illustrating details of the invention.

1 is the standard of the jack having a base 2. This standard is hollow and movable vertically in the standard is vthe plunger 3 carrying at its upper end a head a recessed to lit an axle of an automobile, or other device to be raised. In the present instance, this headcan turn on the plunger, being held to the plunger by a screw 5 which Ventends into an annular recess 6 in the plunger.

In one face of the plunger are teeth 7 shown in detail in Fig. 4f and these teeth en- 'gage a long pinion 8 F ig. 5 loose on a shaft 9, Fig. 6. The' pinion 8 is located in a casing 10 which is enlarged at 11 and provided with a detachable cap 12 and the long pinion 8 extends into this enlargement as shown in Fig. 2 and the teeth of the pinion mesh with internal teeth 13 on a sleeve 14 which is eccentric to the shaft 9 and this sleeve has a projection 15 adapted to a slot 16 in the enlargement 11 of the casingso that it has a limited movement to justify itself in respect to the pinion 8. Gn the shaft 9 is an eccentric 17 adapted to a portion 18 of the sleeve 14C and in the present instance between the eccentric and sleeve is a ring 19 of bronze or other suitable material.. The eccentric 1'? is secured to the shaft by a key 20. Keyed to the opposite end of the shaft is a ratchet wheel 21, Fig. 8, through which the shaft 9 and its eccentric are turned. 22 is a hub that on the line 3%3,

fits on the ratchet wheel as shown in Fig. 3 and this hub has an extension 23 forming part of the handle 24 and in this extension is a pawl 25 fitting in a socket 26. A pin 27 on the pawl 25 is adapted to a slot 28 in the socket so that the pawl cannot turn independently of the socket.

, Back of the pawl is a spring 29 tending to move the pawl forward. On the head of the pawl is a tooth 30 which engages the teeth of the ratchet wheel 21 as shown clearly in Fig. 8. When the pawl is in the position illustrated in Fig. 3 the hub can move in the direction of the arrow without turning the ratchet wheel and shaft 9 but when the movement is reversed the tooth 30 will engage the teeth of theratchet wheel and turn the ratchet wheel, the shaft and the gearing and will move the plunger'in one direction.

In order to reverse the movement of the plunger I so construct the socket member 26 that it will turn in the portion 28, the socket member forming part of the extension 31 which forms a continuation of the handle and this socket member is grooved at 82 to receive a screw 33 which prevents the socket member moving longitudinally. Carried by the socket member is a ball 34 which is adapted to enter either of two recesses 35 in the portion 23. When the ball is in one recess the tooth 30 faces in one direction and ,when the handle member is turned a half turn the ball moves into another recess soy as to lock the tooth 30 in an opposite position. The ball has a spring back of it in the present instance to move ithandle portion the pawl can be turned to cause the plunger 3 to be raised or lowered and by having the pin adapted to the slot this handle section can be removed to allow the jack to be packed into a comparatively small space.

It will be seen that by the above construction I dispense entirely with any form of pawl for holding the plunger in the load sustaining position'and this is accomplished by the heavy parts consisting of a pinion,V a sleeve and the eccentricVv mounted on the shaft,'the vpawl which is attached to the handle forming no part of the mechanism employed in supporting the plunger and the load. The hub 22 in the present instance is held to the shaft 9 by a disk 39 and a screw e0. The disk has a projection al adapted to a notch in the hub of the ratchet wheel and a spring 42 acts to place sufficient fric-V tion on therratchet wheel to prevent it moving asthe handle isreturned after operating the mechanism in one direction. Access may be readily had to the eccentric and sleeve by removing the plate l2 which is vheld to the extension l1 screws 0r other fasteners. y

It will be understood that a different form l of head may be used from that shown, de-

pending upon the use for which the jack is intended and the 4general contour of the jack may be modiiied'as deSired. "While I have shown the pinion as an integral long pinion, it may be made in two parts connected together without departing from the essential features of the invention and the two parts may be of different diameters.

I claim: l

1. The combination in a lifting jack of a standard; av toothed plunger mounted in the Y standard a pinion mounted in the standard, the teeth of the pinion meshing with the teeth of the plunger; a sleeve having Vinternal teeth engaging the pinion; means for i5V Y nal teeth adapted to the teeth of the pinion;

limiting the movement of the sleeve; a shaft extending through the pinion and sleeve; an eccentric on the shaft adapted to the sleeve; and means for turning the shaft.,

2. The combination in a lifting jack of a standard; a casing on the standard; a

plunger vertically movable .in the standardr and having teeth; a pinion mounted in the casing of the Standard, the teeth of the pinion meshing with Vthe teeth of the plunger; an eccentric sleeve having intera casing forming an integralpart thereof,

said casing being enlarged at one side; a toothed plunger mounted vertically inthe standard; a long pinion having its bearings in lthe casing, the teeth of the pinion meshing with the teeth of the plunger; one porl tion of the pinion extending into the enflargement of the casing; a sleeve mounted in the enlargement of the casing and having,

a projection, the casing being slotted for the passage ofthe projection, the sleeve having internal gear teeth meshing with thatportion of the pinion extending into the enlargement; a shaftloosely mounted within the long pinion; and an eccentric mounted in the end of the shaft and adapted to an opening in the sleeve beyond the pinion; and means for turning the shaft in either direc# tion to raise or lower the plunger.

4. The combination in a lifting jack of a standard having a casing; a pinion mounted within the casing; a plunger'having teeth at one edge engaging the teeth of the pinion; a sleeve having internal teeth meshing with the teeth of the pinion; means for limiting the'rotative movement .of the sleeve ;.a shaft extending freely through the pinion and anV eccentric on'the shaft located in the sleeve;

a ratchet wheel securedto the oppositegend` of the shaft; a hub on said ratchet wheel; an extension of the hub forming thehandle and a socket member mounted to turn in this extension; a ball carried by said socket mem ber; and a detachable section forming part of the'handle mounted in the socket member; said socket member being turned toV reverse the ball. Y Y

GEORGE O. LEOPOLD. 

